Including Counterbalancing Means Patents (Class 409/237)
  • Patent number: 10173296
    Abstract: A grinding machine includes a rotatable spindle having a lower end to which a grindstone for grinding a wafer is attached; linear guides supporting the spindle slidably to a column; a spindle feeding mechanism feeding the spindle in a vertical direction; and constant-pressure feeding mechanism interposed between the spindle feeding mechanism and the column and suspending the spindle feeding mechanism. The constant-pressure feeding mechanism raises the spindle feeding mechanism in the vertical direction when a friction force acting on the grindstone is higher than a predetermined value.
    Type: Grant
    Filed: September 29, 2016
    Date of Patent: January 8, 2019
    Assignee: Tokyo Seimitsu Co., Ltd.
    Inventors: Masaki Kanazawa, Kenji Igarashi
  • Patent number: 9058030
    Abstract: Provided is a horizontal machine tool which achieves remarkable accuracy improvement by correcting spatial accuracy while stabilizing the swing of a main spindle. To this end, a horizontal machine tool (10) is provided with: a ram tension bar (20) which corrects the deflection of a ram (17); a lifting force correction mechanism (30) which corrects the inclination of a saddle (16) by adjusting lifting force at two positions where the saddle (16) is lifted; a column tension bar (40) which corrects the bend of a column (14); and a control device which controls the ram tension bar (20), the lifting force correction mechanism (30) and the column tension bar (40) and has a spatial accuracy correction function of correcting the spatial accuracy by numerical control.
    Type: Grant
    Filed: December 8, 2011
    Date of Patent: June 16, 2015
    Inventor: Hiroyuki Tauchi
  • Patent number: 8926241
    Abstract: A machine tool 1 has a support body 11, moving bodies 12, 13, 14, 15 with an engagement member 12a having an engagement hole 12b, a guide mechanism 20 for guiding the movement of the moving bodies 12, 13, 14, 15, a guide rail 31 provided along the moving direction of the moving bodies 12, 13, 14, 15 on the support body 11, a moving member 32 having a moving member body 33 engaged with the guide rail 31 and an engagement shaft 34 provided on the moving member body 33 and engaged with the engagement hole 12b and a collar member 35 provided on the tip portion of the engagement shaft 34, and a compressing spring 38 in which the engagement shaft 34 is inserted and which energizes the engagement member 12a. The engagement member 12a is provided on the opposite side to the moving body 14.
    Type: Grant
    Filed: December 17, 2010
    Date of Patent: January 6, 2015
    Assignee: DMG Mori Seiki Co., Ltd.
    Inventors: Shigetsugu Sakai, Toshio Ueda
  • Patent number: 8764357
    Abstract: A milling machine has a carriage, a main spindle seat extending along an axis, and a motor operable to drive displacement of the main spindle seat relative to the carriage along the axis. A deflection correction system includes a control unit, a displacement sensor, at least one pressure cylinder, and a pressure sensor. The pressure cylinder includes a cylinder body, and a control rod extended retractably into the cylinder body. The control unit is configured to determine a pressure range as a function of displacement detected by the displacement sensor, and to maintain fluid pressure in the pressure cylinder within a pressure range, thereby controlling the control rod via the cylinder body to position the second end portion of the main spindle seat relative to the axis.
    Type: Grant
    Filed: June 14, 2011
    Date of Patent: July 1, 2014
    Assignees: Buffalo Machinery Company Limited, The Department of Engineering, National Chang-Hua University of Education
    Inventors: Kun-Fang Huang, Tsair-Rong Chen, Chia-Hui Tang, Wen-Ren Yang, Paul Chang
  • Patent number: 8668414
    Abstract: In a machine tool, a column base (12) is supported on a bed (11) movably in a horizontal direction, and a column (13) is installed vertically on the column base (12). A saddle (14) is supported on a side of the column (13) movably in a vertical direction, and a ram stock (15) is supported on the saddle (14) movably in a horizontal direction. A main spindle (16) is rotatably supported by the ram stock (15). A weight (22) is supported in the column (13) movably in a direction parallel to the ram stock (15), so that the weight (22) can be moved horizontally by a servo motor (23). An NC device (25) moves the weight (22) by the servo motor (23) synchronously with a movement of the ram stock (15), to adjust balance of the column (13), thereby enabling to reduce the size of an apparatus and realize space saving.
    Type: Grant
    Filed: April 11, 2008
    Date of Patent: March 11, 2014
    Assignee: Mitsubishi Heavy Industries, Ltd
    Inventors: Atsushi Inoue, Satoshi Furutate, Tomoharu Hasegawa, Hiroyuki Domaru
  • Patent number: 8574139
    Abstract: A machine tool having an automatic tool changer (ATC). The machine tool includes a gantry, a spindle extending from the gantry, a configurable work area, and an ATC adjacent to a front wall of the machine tool. The ATC includes a rotary tool magazine and a plurality of receptacles oriented radially around the rotary tool magazine configured to hold a plurality of cutting tools having cutting edges. The cutting edges of the cutting tools point radially inwardly around the rotary tool magazine, and the cutting tools are removed directly from the automatic tool changer by the spindle and brought to a part to be machined. A tool sensor may be located between the ATC and the spindle to take measurements of the cutting tool. The ATC includes at least one receptacle configured to hold a cutting tool.
    Type: Grant
    Filed: August 12, 2009
    Date of Patent: November 5, 2013
    Assignee: Microlution, Inc.
    Inventors: Andrew Honegger, Andrew Phillip, Deepkishore Mukhopadhyay, Abhinandan Tulsian, Elizabeth Creighton
  • Patent number: 8210781
    Abstract: A processing machine includes a machine bed, a spindle seat, a sliding rail unit, and a driving unit. The sliding rail unit is disposed between the machine bed and the spindle seat. The driving unit is used for driving the spindle seat to move within a slot in the machine bed, and includes a threaded rod journalled on a junction between a bottom wall surface and a lateral wall surface of the machine bed, and a nut member disposed fixedly on a junction between a bottom surface and a lateral side surface of the spindle seat and engaging the threaded rod.
    Type: Grant
    Filed: November 12, 2008
    Date of Patent: July 3, 2012
    Assignees: Buffalo Machinery Company Limited, The Department of Electrical Engineering, National Chang-Hua University of Education
    Inventors: Paul Chang, Tsair-Rong Chen, Jeen-Sheen Row, Yuan-Fu Tsai
  • Patent number: 7665200
    Abstract: A multiple purpose CNC machine that is mountable on a framed, mobile dolly. The machine includes: an open frame base Y-axis (200), a gantry X-axis (300), and a double angle plate (400) that provides mounting surfaces for tooling/instruments such as a Z axis module (500). The double angle plate also allows for mounting of a second Z axis module on the opposite face. The modular Z axis module includes a horizontally rigid counterweight assembly. The counterweight assembly facilitates the adding/subtracting of counterbalancing weights. The Y axis base includes provisions for placement of a tooling plate that is secured on precision machined pads of the Y axis base. The pads also include reference dowel pins. The CNC machine is multiple purpose and can be configured with a high-speed spindle or other material-removing tools, can be used with tooling such as in robotic applications, or can be used with a camera system such as for inspection tasks.
    Type: Grant
    Filed: February 27, 2009
    Date of Patent: February 23, 2010
    Inventor: Mike Seiji Shimooka
  • Publication number: 20090232613
    Abstract: Provided is a machine tool spindle balancer that stably pulls and biases the spindle unit upward and thus reduces the load of the lift means for moving the spindle unit vertically, is easily applicable to existing machine tools, highly durable, downsizable, and has a simple structure advantageous in production cost. A spindle balancer 30 comprises a gas spring 31 having a cylinder body 32, a rod 33, and a compressed gas. The gas spring 31 is provided above the spindle unit 10. The bottom end of the rod 33 is coupled to the spindle unit 10 so that the spindle unit is pulled and biased upward by the biasing force of the gas spring 31 that is applied on the rod 33, whereby the biasing force of the gas spring 31 serves to reduce the load of the lift mechanism 20.
    Type: Application
    Filed: March 2, 2006
    Publication date: September 17, 2009
    Inventors: Ichiro Kitaura, Seiji Kimura
  • Patent number: 7524152
    Abstract: A three-axis micro- or meso-scale machining apparatus. Embodiments of the apparatus include a spindle having a tool for machining a workpiece, a z-axis movement platform for supporting the spindle and translating the spindle along a z-axis, a mount for supporting the workpiece, and a suspended x-y axes movement platform for supporting the mount and translating the mount along both x- and y-axes.
    Type: Grant
    Filed: December 3, 2004
    Date of Patent: April 28, 2009
    Assignee: The Board of Trustees if the University of Illinois
    Inventors: Andrew Honegger, Richard E. DeVor, Shiv G. Kapoor
  • Patent number: 7441994
    Abstract: A machine tool includes a machine frame, a worktable, and a spindle unit. The worktable is movable on the machine frame along a first horizontal direction, a second horizontal direction perpendicular to the first horizontal direction, and a vertical direction. The spindle unit is movable on the machine frame along the vertical direction.
    Type: Grant
    Filed: April 2, 2007
    Date of Patent: October 28, 2008
    Inventor: Shu-Yen Hsieh
  • Patent number: 7201548
    Abstract: The present invention relates to a weight compensating device comprising a carrier and a component which is supported on the carrier and is displaceable particularly in vertical direction by means of a drive, characterized in that the carrier and the component have arranged thereinbetween at least one negative pressure body of a variable length which is connected to a negative pressure source for compensating the weight acting on the component.
    Type: Grant
    Filed: May 7, 2003
    Date of Patent: April 10, 2007
    Assignee: P & L GmbH & Co. KG
    Inventor: Jurgen Roders
  • Patent number: 7147595
    Abstract: A CNC machine tool includes a worktable supporting two workpieces and rotatable on a base so as to exchange the positions of the workpieces. A post member is fixed on the base. A first horizontal rail unit is movable vertically on the post member. A second horizontal rail unit is movable on the first horizontal rail unit along a first horizontal direction. A spindle head unit is movable on the second horizontal rail unit along a second horizontal direction perpendicular to the first horizontal direction.
    Type: Grant
    Filed: December 13, 2005
    Date of Patent: December 12, 2006
    Inventor: Hsi-Kuan Chen
  • Patent number: 6932549
    Abstract: In a numerical-control machine tool use is made of a mandrel-holding structure that makes it possible for the machine tool to be used to smoothing/facing and polishing purposes under utilization of traditional pan-like tools, in which the force acting on the working tool is delivered by a pre-established adjustable pneumatic pressure, while the weight of the moving parts of the mandrel is compensated for by a compression spring. When the pneumatic pressure is substituted for by an oleodynamic, i.e. oil-pressure force acting in the opposite direction, the machine switches over to normal operating conditions as a regular numerical-control machine tool.
    Type: Grant
    Filed: July 1, 2003
    Date of Patent: August 23, 2005
    Inventor: Luca Toncelli
  • Patent number: 6916141
    Abstract: A three dimensional tool guide includes first, second and third elongate guide arms mounted orthogonally and in series so as to provide X, Y and Z axes for the guide. The arms are interconnected by carriage means allowing free relative movement between adjacent arms in at least one direction and a balancing means to allow substantially unbiased vertical movement for the arm or arms. The first arm is adapted for mounting to a reference point and the third arm is adapted for holding and guiding the tool.
    Type: Grant
    Filed: June 27, 2003
    Date of Patent: July 12, 2005
    Inventor: Leslie John Owen
  • Patent number: 6902362
    Abstract: In an automatic machine tool (1) comprising a spindle mounting slide (4) which is driven by a linear electric motor (9) in a vertical direction (V) in a slideway (8), the slide (4) is equipped with a counterweight device (13) comprising a cylinder (19) within which there slides a piston 17. The cylinder (19) and the piston (17) form a first balancing chamber (31) and a second counterbalancing chamber (32), the second counterbalancing chamber (32) being connected to a circuit (33) for feeding a fluid (34) under pressure.
    Type: Grant
    Filed: June 17, 2003
    Date of Patent: June 7, 2005
    Assignee: JOBS S.p.A.
    Inventors: Maurizio Ferrari, Adriano Granata, Bruno Schiavi
  • Patent number: 6865788
    Abstract: A numerical-control milling machine having a supporting frame; a worktable fitted to the supporting frame so as to oscillate about a substantially horizontal first axis of rotation, and in turn having two rotary platforms, each for accommodating a workpiece; and two independent work units, each of which is fitted movably to the supporting frame, alongside the worktable, is positioned facing a corresponding platform, and provides for machining the workpiece on the platform; the two work units selectively operating either asynchronously, to machine the workpieces fixed to the two platforms independently of each other, or synchronously to perform the same machining operations simultaneously on the workpieces fixed to the two platforms.
    Type: Grant
    Filed: August 20, 2002
    Date of Patent: March 15, 2005
    Assignee: O.M.V. Officine Meccaniche Venete S.r.l.
    Inventor: Franco Pasquetto
  • Patent number: 6835033
    Abstract: A device for using a parallel structure designed for positioning and displacing a mobile member including at least a fixed element and at least three actuators each including a fixed part and a mobile part, the mobile member including a support-sheath of a tool spindle. The device includes a balancing assembly which, enabling the support-sheath to move in rectilinear manner along axes X, Y and Z, maintains the support-sheath such that the weight of the support-sheath is not transferred to the parallel structure.
    Type: Grant
    Filed: February 24, 2003
    Date of Patent: December 28, 2004
    Assignee: Renault Automation Comau
    Inventor: Claude Fioroni
  • Publication number: 20040226155
    Abstract: A lathe attachment device is disclosed for producing long articles with complicated profiles. The device contains a beveled multi-teeth cutter driven to rotate in a direction opposite the rotation of a billet to ensure a very short period of contact time between an individual cutting tooth and the article. The cutter is slightly tilted towards the billet in both horizontal and vertical plane. The teeth of the cutter are shaped to each have a pointed end facing the rough part of the billet. Provisions are made to draw the cutter along the billet. The device allows producing a smooth finished long article with complicated surface profile in a single pass with high productivity. Due to limited contact time, it offers extended life of the cutter. The device is used most advantageously to produce long wood articles.
    Type: Application
    Filed: February 18, 2004
    Publication date: November 18, 2004
    Inventor: Alexandr Ivanovich Krukov
  • Publication number: 20040022595
    Abstract: A three dimensional tool guide includes first, second and third elongate guide arms mounted orthogonally and in series so as to provide X, Y and Z axes for the guide. The arms are interconnected by carriage means allowing free relative movement between adjacent arms in at least one direction and a balancing means to allow substantially unbiased vertical movement for the arm or arms. The first arm is adapted for mounting to a reference point and the third arm is adapted for holding and guiding the tool.
    Type: Application
    Filed: June 27, 2003
    Publication date: February 5, 2004
    Inventor: Leslie John Owen
  • Patent number: 6612792
    Abstract: The present invention provides a work table for use with a tool, comprising an inclined work surface, which is substantially planar and is supported by a frame having a base; a gantry movably attached to the work surface and having two ends, a longitudinal axis and extending within a plane parallel to the work surface; a movable tool mount slidably attached to the gantry for removable attachment of the tool wherein the tool mount and the tool have a combined effective weight; a first movement means attached to one end of said gantry for translation of the gantry over said work surface; a second movement means attached to the tool mount for translation of said tool between the ends of the gantry; and a weight counterbalancing means operatively associated with the tool mount for neutralising the combined effective weight.
    Type: Grant
    Filed: April 25, 2001
    Date of Patent: September 2, 2003
    Assignee: CAM Tech Industries Inc.
    Inventor: Dwaine Barclay
  • Publication number: 20030063957
    Abstract: An apparatus for compensating position error of a spindle head, comprises: Y-axis control parts 32a, 32b for controlling first and second servomotors 24a, 24b on the basis of a spindle head moving command fed from a numerical control unit 30; a correction data storage part 36 for storing correction data determining the relationship of a feed distance of a ram 18 to a compensation value for correcting the vertical deviation of the ram 18 in the feed distance of the ram 18; and a correction means 44 for being introduced a ram feed instruction, which is fed from the numerical control unit, and for reading out compensation value corresponding to the feed distance of the ram from the correction data storage unit 36, to correct the spindlehead feed instruction by adding or subtracting the compensation value to or from the spindlehead feed instruction.
    Type: Application
    Filed: September 26, 2002
    Publication date: April 3, 2003
    Inventor: Katsumi Hirabayashi
  • Patent number: 6540459
    Abstract: The invention relates to an apparatus for counterbalancing the weight of movable machine parts of a machine tool. A simply and compactly designed apparatus of this kind enabling a weight compensation even without complex pressure supplies is, according to the invention, characterized in that it comprises one or more helical springs (1;15 to 18) the one end (7, 29) of which is connected to the movable machine part (12; 35) for generating a counter-force counteracting the weight force for the movable machine part.
    Type: Grant
    Filed: May 23, 2001
    Date of Patent: April 1, 2003
    Assignee: Deckel Maho Geretsried GmbH
    Inventor: Klaus Hofmann
  • Patent number: 6474915
    Abstract: A hexapod, for example, a hexapod used to position a tool with respect to a part to be machined, includes two spaced plates interconnected by six articulated and extensible legs. The two plates, including a base plate and a mobile plate, and the six legs are joined for varying, at will, the relative position of the mobile plate with respect to that of the base plate. The hexapod further includes a device for reducing and/or compensating for stresses on the elements of the hexapod, which can be a mechanical device, such as a jack, coupling a fixed surface with the periphery of the mobile plate and/or logic (in software) for defining at least one force-limiting criterion.
    Type: Grant
    Filed: October 25, 2000
    Date of Patent: November 5, 2002
    Assignee: Constructions Mécaniques des Vosges
    Inventor: François Wildenberg
  • Patent number: 6439813
    Abstract: A machine tool includes a spindle-headstock structure with a horizontal axis which is displaceable along three mutually orthogonal axes. The headstock structure is mounted so that it slides along an axis Z parallel to the axis of the spindle on a slide. The slide is mounted so that it slides according to a horizontal direction X orthogonal to the axis of the spindle beneath a cross member. The cross member moves vertically between the two uprights of a fixed portal frame.
    Type: Grant
    Filed: September 5, 2000
    Date of Patent: August 27, 2002
    Assignee: Ministero Dell'Universita'E Della Ricera Scientifica E Tecnologia
    Inventor: Claudio Repossini
  • Patent number: 6435784
    Abstract: In order to make notches in partitions separating substantially aligned recesses issuing onto the surface of a structure (10), use is made of a machining head (26) having a cutting tool (28) and at least one rotary member (52) adjacent to said tool. The rotary member (52) is provided with protuberances (54) supported in recesses of a row of recesses adjacent to that which is being machined, during the displacement of the machining head (26). The latter is connected with slackness to a tool holder by a mechanism, a lateral and height positioning of the tool (28) being ensured during machining.
    Type: Grant
    Filed: December 18, 2000
    Date of Patent: August 20, 2002
    Assignee: EADS Airbus SA
    Inventors: Denis De Mattia, Bernard-Albert Colin
  • Patent number: 6334745
    Abstract: An apparatus for working on both sides of a flat workpiece includes a first support surface having a first axial line thereacross, a second support surface juxtaposed to and associated with the first support surface and having a second axial line thereacross which lies in a common plane with the first axial line, and a first carrying assembly operably connected to the first support surface in a manner to movably reciprocate along the first axial line and having a first extending arm which is laterally displaced from one side of the common plane and a second extending arm which is laterally displaced from another side of the common plane. A second carrying assembly is operably connected to the second support surface in a manner to movably reciprocate along the second axial line, wherein the second carrying assembly includes a workpiece removably mounted in a manner to position the workpiece in the common plane between the arms such that the arms extend about the workpiece.
    Type: Grant
    Filed: July 12, 1999
    Date of Patent: January 1, 2002
    Inventor: Timothy J. Bennett, Sr.
  • Patent number: 6145178
    Abstract: A machine tool comprises a base with an upstanding column, a vertical spindle axis tool driving unit symmetrically located and vertically movable on the front of the column, a frontwards oriented horizontal spindle axis tool driving unit symmetrically located and vertically movable extending through the column, and a pair of guiding rails to extend vertically thereon and horizontally spaced apart from each other for guiding the upward and downward movement of the tool driving units. Symmetrically disposed counterbalance weights for both tool driving units are located within the column. Independent leadscrew driving means provide vertical upward and downward movement of the tool driving units.
    Type: Grant
    Filed: August 19, 1999
    Date of Patent: November 14, 2000
    Assignee: Green Technologies, Inc.
    Inventor: Steve C. Green
  • Patent number: 5988959
    Abstract: A spindle supporting box structure, wherein longitudinal parts forming both ends of lateral parts at each of right and left longitudinal side faces facing, with a spindle therebetween, in a direction almost perpendicular to longitudinal side faces facing in a front-back direction are formed by longitudinal tubular members having suitable flexural rigidity. A damping structure wherein required frameworks of structures are formed by tubular members and wherein concrete is filled in the tubular members and then solidified. As an alternative, a powdery damping material or a jelly damping material is airtightly sealed in the tubular members. An inner space of one or more of the tubular members is made into a gas pressurized tank wherein a balance cylinder is connected to the gas pressurized tank and wherein the gas in the gas pressurized tank directly acts on a cylinder chamber of the balance cylinder.
    Type: Grant
    Filed: October 15, 1997
    Date of Patent: November 23, 1999
    Assignee: Horkos Corp.
    Inventor: Shinsuke Sugata
  • Patent number: 5873685
    Abstract: The disclosed press processing method and device can chamfer work, for instance by pressing a chamfering tool against the work at a predetermined contact pressure, without detecting the pressing force of the chamfering tool against the work or without feedbacking the detected pressing force to a robot controller. The press processing device used being mounted on automatic mechanical processing means such a multi-joint robot, comprises: a processing section (e.g., grinder) (11) held by a support body (12) in such a way that pressure caused by a dead load of the processing section is not applied to a processing portion (e.g. blade) (11d) of the processing section (11); a constant torque applying section (e.g., servomotor) (16) for pivoting the processing section in a predetermined direction at a constant torque; and a mounting member (20) for mounting the constant torque applying section to a robot arm (R).
    Type: Grant
    Filed: February 21, 1997
    Date of Patent: February 23, 1999
    Assignee: Kawasaki Jukogyo Kabushiki Kaisha
    Inventors: Eiichi Yagi, Katsumi Nakashima, Yasuo Nakano, Satoru Sakanaka, Toshiaki Nishiyama, Hirozo Hishida
  • Patent number: 5569004
    Abstract: A machine tool is provided in which a carriage is supported on the upper flat surface of a work table by first bearings. The carriage extends beyond the bearings in one direction to support a tool, so that the weight of the carriage and tool creates a moment tending to rotate the carriage downwardly toward the work table on one side of the bearings. This is countered by a second bearing that extends to a second downwardly facing surface which may be a separate element or the undersurface of the work table. The second surface is adjustable for parallelism with the work table. Linear actuators move the carriage over the work table. In a multispindle machine, three actuators are required, at least two of which are nonparallel.
    Type: Grant
    Filed: July 1, 1994
    Date of Patent: October 29, 1996
    Assignee: Optima Industries, Inc.
    Inventor: William F. Marantette
  • Patent number: 5090279
    Abstract: A vertical spindle pedestal, especially for attachment to a lathe, which vertical spindle pedestal includes a vertical column and a motor driven vertical spindle vertically adjustable relative to the column, the vertical column being a hollow one on which a spindle housing is vertically slidably supported. A tension band is attached to the housing and guided over a reversing roll carried by the upper end of the column to a free end connected to a tension spring located inside the hollow column and anchored to it, the vertical column further carrying means for vertically adjusting the spindle housing along its length. The means for vertically adjusting the spindle housing includes a rotatable vertical lead screw supported by the upper end of the vertical column for rotation and against axial shifting which lead screw cooperates with a lead screw nut fixed to the spindle housing.
    Type: Grant
    Filed: September 4, 1990
    Date of Patent: February 25, 1992
    Assignee: EMCO MAIER GmbH
    Inventor: Kurt Enzinger
  • Patent number: 4923345
    Abstract: A device and process for adjusting the position of a tool-holder head along an axis with the tool-head moving along a guiding element and with a pulley mounted to rotate freely on a shaft secured to the tool-holder head and which is moveable along a taut cable. A maneuvering handle is provided and may be in mesh with the pulley in order to drive it or may be moved away therefrom so as to be free to rotate on the shaft.
    Type: Grant
    Filed: January 17, 1989
    Date of Patent: May 8, 1990
    Assignee: Technifor
    Inventor: Marcel Therond
  • Patent number: 4787786
    Abstract: The present invention relates to a cutting device suitable for cutting one part of a laminate to conform its shape to the other part of the laminate. The device comprises a vertical motion means mounted on a horizontal motion means, the vertical motion means having a rotating cutting blade mounted thereon. The cutting device is able to conform a veneer to the exact shape of a subsurface base within 0.001 inch.
    Type: Grant
    Filed: August 24, 1987
    Date of Patent: November 29, 1988
    Inventors: Ivan B. Freud, Alan Melcer
  • Patent number: 4447178
    Abstract: A horizontal drilling and milling machine comprises a vertically movable headstock and a spindle sleeve mounted for horizontal run-out from the headstock. Typically, an outer end of the spindle sleeve undergoes a vertical deflection relative to the headstock during run-out, which deflection is an exponential function of the extent of the run-out. A correcting means is connected to the headstock to move the latter as the run-out proceeds, to effect a vertical correction displacement of the forward end of the spindle sleeve, which displacement is the same exponential function of the extent of the run-out as that of the vertical deflection relative to the headstock. Correction is achieved by comparing a signal indicative of the extent of the run-out, with a predetermined exponential function for the particular spindle sleeve and tool, and generating a suitable correction signal in response thereto. A memory and computer device is employed to make the necessary comparison.
    Type: Grant
    Filed: February 25, 1982
    Date of Patent: May 8, 1984
    Assignee: Scharmann GmbH & Co.
    Inventor: Karl-Josef Esser
  • Patent number: 4444534
    Abstract: A machine tool apparatus having a bifurcated column structure comprising spaced apart columns which enclose and slidably secure the mounting end of an arm, the opposite end of which receives a rotating spindle adapted to engage and rotate a variety of machining tools. The bifurcated column structure has three primary ways having their guiding surfaces arranged generally in one plane, and the third having its guiding surface in a plane orthogonally related to the plane of the first ways. The column structure also includes three secondary ways positioned in opposed relation to the respective primary ways. Antifriction bearings are connected to the mounting end of the arm in opposed relation to the three primary and three secondary ways and serve to guide the arm for vertical movement within the column structure.
    Type: Grant
    Filed: April 27, 1981
    Date of Patent: April 24, 1984
    Inventor: Raymond A. Bergman